August 12, 2016
How to purge UDCs on the HP 3000 safely
The software vendors most likely to sell products for a flat rate -- with no license upgrade fees -- have been the system utility and administration providers. Products such as VEsoft's MPEX, Robelle's Suprtool, Adager's product of the same name -- came in one, or perhaps two versions, at most. The software was sold as the start of a relationship, and so the relationship focused on the understanding the product provided for people responsible for HP 3000s.
That kind of understanding might reveal a Lewis Carroll Cheshire Cat's smile inside many an HP 3000. The smile is possible if the 3000 uses UDC files and the manager uses only MPE to do a file PURGE. Of course, PURGE ships on all MPE systems. Using that means you'll have to rebuild the UDC catalog. But even that's not enough.
Stan Sieler of Allegro shared a story about this recently. "We recently encountered a site where—somehow—an HFS filename had gotten into COMMAND.PUB.SYS. You can't delete UDC entries with HFS filenames, nor can you add them. I had to edit the file with Debug to change the name into something delete-able." Then there's the rebuilding of the catalog. Keven Miller has contributed a program that sorts and reorganizes UDC files.
There is a more complete way to remove such things from a 3000's storage. You're careful about this because eliminating UDCs with only MPE might leave a user unable to use the server. That grin that lingers is the UDC's filename.
User Defined Commands are a powerful timesaver for 3000 users, but they have administrative overhead that can become foolproof using the right tools. These UDCs need to be maintained, and as users drop off and come on the 3000, their UDCs come and go. There's always a chance that a UDC file could be deleted, but that file's name could remain in the filesystem's UDC master catalog. When that happens, any other UDCs associated with the user will fail, too. It might include some crucial commands; you can put a wide range of operations into a UDC.
When you add a third party tool to your administrator's box, you can make a purge of such files foolproof. You can erase the Cheshire Cat's grin as well as the cat. It's important because that grin of a filename, noted above, can keep valid users from getting work done on the server with UDCs. This is not the reputation anybody expects from a 3000.First you have to find all of your UDCs on a system, and MPE doesn't make that as straightforward as you might think. Using SHOWCATALOG is the standard, included tool for this. But it has its limitations. It can display the system-level UDC files of all users in all accounts. But that's not all the UDCs on a 3000.
MPE, after all, cannot select to show a complete set files by attributes such as program capability. Or for that matter, by last accessed time, or file size, or file security. It's a long list of things that MPE makes an administrator do on their own. Missing something might be the path to looking foolish.
Employing a couple of third party tools from VEsoft, VEAudit and MPEX, lets you root out UDCs and do a foolproof purge, including file names. VEAudit will list all of the UDCs on a server, regardless of user -- not just the ones associated with the user who's logged in and looking for UDCs. The list VEAudit creates can be inverted so the filename is the first item on each line. Then MPEX will go to work to do a PURGE. Not MPE's, but a user-defined purge that looks for attributes, then warns you about which ones you want to delete, or would rather not.
By using MPEX -- the X stands for extended functionality -- you can groom your own PURGE command to look out for files that have been recently used, not just recently created. MPE doesn't check if a purged file is a UDC file.
Such 3000 utilities provided the server and its managers with abilities that went far beyond what HP had built into MPE and its IMAGE database. Now that MPE is moving on, beyond HP's hardware, knowing these third party tools will transfer without extra upgrade fees is like ensuring that a foolproof MPE will be running on any virtualized HP 3000.
They're an extra-cost item, but how much they're worth depends on a manager's desire to maintain a good reputation.
In the earliest days of the sale of these tools, vendors were known for selling them for the price of the support contract alone. That's usually about 20 percent annually of the purchase price. If a $4,000 package got sold that way, the vendor billed for just $800 at first. It made the purchases easier to pass through a budget, since support at the manager-tool level was an easier sell. Think about it. Such third parties passed up $3,200 per sale in revenues in the earliest days. They also established relationships that were ongoing and growing. They were selling understanding of MPE, not just software.
This kind of practice would be useful for the community's remaining software vendors. This is not the time to be raising prices to sustain MPE computing, simply because there's a way to extend the life of the hardware that runs MPE. As the number of MPE experts declines, vendors will be expected to fill in the gaps in understanding. Those who can do this via support fees stand the best chance of moving into the virtualized future of 3000 computing.
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